This is a great addition to my Flex2 when I'm walking on a treadmill or when I'm shopping and pushing a cart and not counting my steps. I usually tape a Fitbit brick here and attach it to either my boot or bra strap. I've seen issues with people talking about it detaching and losing your Fitbit, but I'm trying to put it somewhere where it gets pretty tight (instead of a belt loop or waistband, etc.). The magnet is pretty strong for its size, so it sometimes snaps onto other metals nearby, but it never came loose on mine. The pebble itself fits snugly inside, so if you don't insert it correctly, it's unlikely to fall out. I really like having it to count the steps I missed.
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